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EMPLOYEE BENEFIT PLANS (Future benefit payments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jan. 01, 2016
Nonunion Defined Benefit Pension Plan    
Estimated future benefit payments    
2017 $ 26,608  
2018 12,386  
2019 12,372  
2020 12,543  
2021 12,031  
2022-2026 51,341  
Required minimum contributions    
Adjusted funding target attainment percentage   107.80%
Supplemental Benefit Plan    
Estimated future benefit payments    
2017 989  
2019 3,107  
Postretirement Health Benefit Plan    
Estimated future benefit payments    
2017 690  
2018 777  
2019 854  
2020 928  
2021 1,003  
2022-2026 $ 6,202